Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Plasmonics and Nanooptics I

O 11.2: Vortrag

Montag, 14. März 2011, 15:15–15:30, PHY C213

Coupled nanoantenna plasmon resonance spectra from two-photon laser excitation: longitudinal and transversal emission — •Matthias D. Wissert¹, Carola Moosmann¹, Konstantin S. Ilin², Michael Siegel², Uli Lemmer¹, and Hans-Jürgen Eisler¹ — ¹Light Technology Institute, DFG Heisenberg Group ’Nanoscale Science’, Karlsruhe Institute of Technology, Germany — ²Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology, Germany

We report on the plasmonic mode relaxation of coupled optical gold nanoantennas under two-photon laser excitation at 810 nm [1]. An oil immersion objective lens is used both for the excitation and detection channel. The plasmon emission intensity from single nanostructures is detected using a single-photon-counting avalanche photodiode, the response spectrum is observed with an EMCCD camera.

We show that the plasmon spectra are very similar to the well known scattering resonances [2] for such structures, albeit now obtained from single frequency excitation. We also show that not only the longitudinal, but also the transversal plasmon mode can be excited, using excitation light polarized exclusively along the long axis of the dipole antenna.

[1] M.D. Wissert, K.S. Ilin, M. Siegel, U. Lemmer, and H.-J. Eisler, Nano Letters 10, 4161 (2010)

[2] M.D. Wissert, A.W. Schell, K.S. Ilin, M. Siegel, and H.-J. Eisler, Nanotechnology 20, 425203 (2009)